From a3fced5da1e6734a6087d246094865997cd4b083 Mon Sep 17 00:00:00 2001
From: Jonah Williams <jonahwilliams@google.com>
Date: Thu, 30 Jan 2025 11:41:04 -0800
Subject: [PATCH] [Impeller] Disable Vulkan on Emulators. (#162454)

Forces known android emulators to use OpenGLES. This is a very
conservative check that could be expanded over time if need be. For
testing emulators can still use the debug flags.

Fixes https://github.com/flutter/flutter/issues/160442
Fixes https://github.com/flutter/flutter/issues/160439
Fixes https://github.com/flutter/flutter/issues/155973
---
 .../flutter/shell/platform/android/flutter_main.cc | 14 ++++++++++++++
 .../flutter/shell/platform/android/flutter_main.h  |  2 ++
 .../android/platform_view_android_unittests.cc     |  8 ++++++++
 3 files changed, 24 insertions(+)

diff --git a/engine/src/flutter/shell/platform/android/flutter_main.cc b/engine/src/flutter/shell/platform/android/flutter_main.cc
index 4159d3713c..31aa094b07 100644
--- a/engine/src/flutter/shell/platform/android/flutter_main.cc
+++ b/engine/src/flutter/shell/platform/android/flutter_main.cc
@@ -5,7 +5,9 @@
 #define FML_USED_ON_EMBEDDER
 
 #include <android/log.h>
+#include <sys/system_properties.h>
 #include <optional>
+#include <string>
 #include <vector>
 
 #include "common/settings.h"
@@ -230,6 +232,11 @@ bool FlutterMain::Register(JNIEnv* env) {
   return env->RegisterNatives(clazz, methods, std::size(methods)) == 0;
 }
 
+// static
+bool FlutterMain::IsDeviceEmulator(std::string_view product_model) {
+  return std::string(product_model).find("gphone") != std::string::npos;
+}
+
 // static
 AndroidRenderingAPI FlutterMain::SelectedRenderingAPI(
     const flutter::Settings& settings) {
@@ -266,6 +273,13 @@ AndroidRenderingAPI FlutterMain::SelectedRenderingAPI(
     if (api_level < kMinimumAndroidApiLevelForVulkan) {
       return kVulkanUnsupportedFallback;
     }
+    char product_model[PROP_VALUE_MAX];
+    __system_property_get("ro.product.model", product_model);
+    if (IsDeviceEmulator(product_model)) {
+      // Avoid using Vulkan on known emulators.
+      return kVulkanUnsupportedFallback;
+    }
+
     // Determine if Vulkan is supported by creating a Vulkan context and
     // checking if it is valid.
     impeller::ScopedValidationDisable disable_validation;
diff --git a/engine/src/flutter/shell/platform/android/flutter_main.h b/engine/src/flutter/shell/platform/android/flutter_main.h
index c572b458fb..4db1230882 100644
--- a/engine/src/flutter/shell/platform/android/flutter_main.h
+++ b/engine/src/flutter/shell/platform/android/flutter_main.h
@@ -26,6 +26,8 @@ class FlutterMain {
   static AndroidRenderingAPI SelectedRenderingAPI(
       const flutter::Settings& settings);
 
+  static bool IsDeviceEmulator(std::string_view product_model);
+
  private:
   const flutter::Settings settings_;
   DartServiceIsolate::CallbackHandle vm_service_uri_callback_ = 0;
diff --git a/engine/src/flutter/shell/platform/android/platform_view_android_unittests.cc b/engine/src/flutter/shell/platform/android/platform_view_android_unittests.cc
index fc1c2d9d1b..321e2e26b9 100644
--- a/engine/src/flutter/shell/platform/android/platform_view_android_unittests.cc
+++ b/engine/src/flutter/shell/platform/android/platform_view_android_unittests.cc
@@ -34,5 +34,13 @@ TEST(AndroidPlatformView, SoftwareRenderingNotSupportedWithImpeller) {
   ASSERT_DEATH(FlutterMain::SelectedRenderingAPI(settings), "");
 }
 
+TEST(AndroidPlatformView, FallsBackToGLESonEmulator) {
+  std::string emulator_product = "gphone_x64";
+  std::string device_product = "smg1234";
+
+  EXPECT_TRUE(FlutterMain::IsDeviceEmulator(emulator_product));
+  EXPECT_FALSE(FlutterMain::IsDeviceEmulator(device_product));
+}
+
 }  // namespace testing
 }  // namespace flutter